New Version API Of USPS

Before authorization, you need to contact USPS to ensure that all services have been officially opened;
Information acquisition
Consumer Key and Consumer Secret

1.Enter the USPS developer backstage
https://developer.usps.com/ After logging in, click APPS and enter the corresponding APP, then you can see it.
 
 
2. EPS Account and CRID 
Log in https://gateway.usps.com/eAdmin/view/signin, then Go to Management and confirm that the ACH bank card has been bound and the ERP position in the upper left corner is green, which is the EPS ID. 
The pure numbers after Business Location Below green are CRID.
3. MID and manifestMID Go into https://mid.usps.com/ws/index.html#/ Scroll down and find the address for binding Mailer ID User.